Collection contains 23 folders of newspaper and magazine articles about singer Maria Callas. It also includes 7 folders of concert programs and Dr. Perry's bound scrapbook of Callas clippings.

Collection contains 85 items, including letters to Dr. Perry, autographed programs, and autographed cards. It also includes the collection, Following a Star that consists of mimeographed copies of letters written by May Higgens to members of the Claudia Muzio Fan Club.

Collection contains 6 folders of papers related to Perry's association with the Chicago Lyric Opera and 48 folders of clippings he compiled about vocalists, instrumentalists, conductors, and music halls.

The collection contains Lejaren Hiller's personal collections of reel to reel tapes pertaining to his compositional output. It includes recordings of live performances of works as well as recordings of some of the electronic source materials used in other compositions.

Flow charts created for computer music composition by Lejaren Hiller and included as figures and illustrations in his published articles about the processes used in writing computer music, including his works, , and . The collection also contains unidentified flow charts and diagrams, as well as negatives of other charts created by Hiller.

The Leo Smit Papers comprise works lists compiled by Leo Smit, articles written by Smit, personal correspondence (chiefly photocopies of letters from Aaron Copland), programs, reviews, and lecture materials.

Chiefly black and white photographs documenting Leo Smit's life and career in music.

The collection consists of 123 scores of compositions by Leo Smit, principally in copies of holographs. There are 21 scores of works by other composers arranged or transcribed by Smit. The remaining 41 scores are works by other composers either inscribed to Smit or marked for performance by Smit.

The Leo Smit Slide Collection contains approximately 13,705 35 millimeter slides taken by American composer, Leo Smit. The contents include images of notable musicians, images used in his lecture recitals, and images taken during his many journeys in the United States and abroad, including Central and South America, Italy, and various other European countries.

The Livingston Gearhart Collection of Scores contains compositions and arrangements by Gearhart in published and manuscript forms, as well as sketches and incomplete works. It also contains published scores by other composers annotated by Gearhart.